Today we introduce the commonly used oil seamless steel pipe, oil pipe (GB9948-88) is suitable for oil refinery furnace tube, heat exchanger and seamless pipe.

Steel pipe for geological drilling (YB235-70) is used for core drilling by geological department, which can be divided into drill pipe, drill collar, core pipe, casing pipe and precipitation pipe according to its use.

Oil pipe is a kind of long steel with hollow section and no joint around, while petroleum cracking pipe is a kind of economic section steel.
API: It is the Abbreviation of The English American Petroleum Institute, Chinese meaning for the American Petroleum Institute.

OCTG: It is the abbreviation of Oil Country Tubular Goods, which means Oil special pipe in Chinese, including finished Oil casing, drill pipe, drill collar, collar, and short joint, etc.

Tubing: A pipe used in oil and gas production, water injection, and acid fracturing in a well.

Casing: A pipe run from the surface of the earth into a well-drilled hole as a lining to prevent the wall from collapsing.

Drill pipe: pipe used to drill holes.

Pipe: a pipe used for conveying oil and gas.

Collar: a cylinder with an internal thread used to connect two threaded pipes.

Coupling material: pipe used to make coupling.

API threads: pipe threads specified in API 5B, including round pipe threads, short round pipe threads, long round pipe threads, offset trapezoidal pipe threads, pipeline pipe threads, etc.

Special thread: non API thread type with special sealing, joining and other properties.

Failure: loss of original function due to deformation, fracture and surface damage under specific service conditions. The main forms of casing failure are: extrusion, slip, rupture, leakage, corrosion, bonding, wear and so on.